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build: note that GIT_AUTH_TOKEN is incompatible with GitLab CI_JOB_TOKEN

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GitLab CI job tokens require Basic authentication with the username
gitlab-ci-token, but BuildKit always uses x-access-token as the
username for Basic auth. This makes GIT_AUTH_TOKEN and GIT_AUTH_HEADER
unusable with CI_JOB_TOKEN. Users must use a Personal Access Token.

Fixes #22834
This commit is contained in:
Nedunchezhiyan-M
2026-04-17 19:22:16 +05:30
parent 375ab48f7b
commit 1ededfd6eb
1 changed files with 7 additions and 0 deletions
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7
content/manuals/build/building/secrets.md
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@@ -194,6 +194,13 @@ To authenticate the builder to the Git server, set the `GIT_AUTH_TOKEN`
environment variable to contain a valid GitLab access token, and pass it as a
secret to the build:
> [!NOTE]
>
> `GIT_AUTH_TOKEN` and `GIT_AUTH_HEADER` are not compatible with GitLab's
> `CI_JOB_TOKEN`. GitLab CI job tokens require Basic authentication with the
> username `gitlab-ci-token`, but BuildKit always uses `x-access-token` as the
> username for Basic auth. Use a Personal Access Token instead.
```console
$ GIT_AUTH_TOKEN=$(cat gitlab-token.txt) docker build \
--secret id=GIT_AUTH_TOKEN \